Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef9b18d311357c3…

MALICIOUS

PDF

94.0 KB Created: 2021-08-15 11:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29288102d2939d0242774c50c0e36593 SHA-1: e5efbb54f5c17247f5f4aad2e62f34a71bef9177 SHA-256: 2ef9b18d311357c34bcd65ec64261fe697b0ab1157cb74761d595a994a7f993c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs point to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seeyounow.net/userfiles/file/rutatusoxemupovubareta.pdf In PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60C5BCD914ADD.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100513964888---48096156244.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af722103f5f---60838002728.pdfIn PDF document text
    • http://gibisch.biz/files/files/48048162240.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/ranimuku.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087987bccbbe---74025468891.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e34e3b151ea---dorokalup.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090701b82c83---89533291092.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/45216959853.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/8297070921.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/ralojawikizozotaru.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/dea74c60abb918fe5f70464d77d21329/nujoxifativujefemete.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/koxib.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/zemetowadobewi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1f1d8f0dd201cbcd3b41dd12dce44c26/19912136850.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/delitebofubojo.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/82593807285.pdfIn PDF document text
    • http://nessium.net/userfiles/file/96638512326.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160779b9315678---3840024566.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/31935447494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=basic+english+speaking+conversation+practice+for+beginners+daily+speaking+english+conversationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 11364 bytes
SHA-256: da06d2482ffa3ddda9c055963c2ebf9903870212b503ea1935636efff7d3be83
font_01_sfnt_off000121b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CB 17972 bytes
SHA-256: 7684218a96105fe08998c17e05b4bb15c69f40d8dbf621173cdda6246a728185

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